Jaw or breaker plate for stone crushers and the like



Sept. 20, 1927.

1,643,048 F. BECHGAARD CII Patented Sept. 20, 1927.

@UNITEDSTATES OFFICE?- 1 Pour.` BnoHeaARn, or DALBY, swnnnN.

JAW on BREAKER PLATE Fon. sToNn cRUsH'ERs AND THE LIKE.

vAppnea'cmi filed october so; 19.26, serial No. 145,174, and in sweden october 1a, 1924.

This invention `refers tofjaws orbreaker plates. for stone crushers and .has for its objecttoylengthen the life of the plates which, asis well known, are subjected tol great wear` and-tear. kAs the teeth. or ridges 'non the working surface `of such breaker plates become wornvaway after a comparatively short lapse of time Yon aC- count ofthe continual and intense wear. against the material to vbe crushed it has,

' already been proposed to make-theworking surfacev having teethb'orv ridgesexchange-` able,r butl great difliculties y have arisen-in producing a satisfactory device' for fixing the working surface subjected to great stresses so that it does not get loose. Conventional fastening devices 'are of no use,-

and for this reason it has been proposedto fix the part forming the working surface by means of tongues integral therewith and corresponding grooves in the breaker plate, a soft and easily meltablemetal beingfcaist in the space between the tongues and the walls of the grooves. This arrangement however is also not quite satisfactory, lbecause `it has been found that the softme'tal has the tendency to flow out under the great stresses acting upon the breaker plate. The object of the invention therefore is to solve this problem according to another principle, that-'is to' construct or form the jaw or breaker plate in such a manner that it 0ffers a quite new working surface upon the original K working surface having become worn out. By this means the `necessity of providing exchangeable parts and thevdisadvantages connected therewith have been completely avoided.

The invention is illustrated by way of example in two preferred forms vof embodiment in the accompanying drawing which shows in Figs. l and 2 cross sections through a portion of a jaw or breaker plate according to the invention.A The original or. initial working surface of the breaker rplate is denominated 1 and 2 are the teeth or ridges thereon. Closely under the surface of thesev ridges there are arranged cavities 3l of approximately the same form and sectionalV area as the spaces between the ridges 21 an imaginary line 9 being drawn touching the tops of the ridges. These cavities 3 are in juxtaposition tothe spaces between the ini tial ridges 2 and they are filled by casting into the same molten softer or more brittle metalj such as for instance lead, cast iron or Vtough and hard steel. ridges 2 ,form ai continuous piece and are integral'withV the body lof the breaker plate through durablebars 5, the corners of the cavities 3 nearl these bars being rounded ofi". The initial ridges 2y hang together by the th-inner portions 6. In a modification shown in Fig. 2 .these thinner portions are left out entirely and the space obtained thereby may be filled as at 7 with the same metal as the cavities 3 and in this case may ihefiike. 'Thema hand may a in Fig. i the like', and,

serve as ingate, when the cavities are filled. K

It will be quite obvious that when the initial teeth or ridges 2 have been completely worn out and the met-al cast into the cavities 3 has thereupon been removed the breaker plate will oder a quite new working surface having teeth or ridges 8 instead of the former ones 2, so that thereafter the jaw or breaker plate` is as good'as new. In this manner the longevity of the jaw or breaker plate obviously is doubled, and it does not appear impossible to further lengthen the life of a breaker plate by arranging a further series of similar cavities underneath the cavities 3 above described.

It is to be understoodY that the invention is not limited to the specific forms of em-V bodirnent herein shown and described, for the forms of theteeth or ridges and of the cavities and the positions of the latter in re lation to the ridges may be varied without depreciating the contemplated result. It is Vfurther not `absolutely `essential to fill the faces. Another methodto fill the cavities is to use rods or bars of cast iron or the like as cores, when the breaker plate is cast. and to` leave these cores in their places. If in this case the initial teeth or ridges 2 are worn ont so that they no longer could be used, the remaining pol-tions thereof and the cores forming' the tillings oi. the cavities eonld be knocked away by ineens ot :L Sledge oithe like.

What l elztiln :ind desire to xeeni'e by Lettern l-)utent ier- 1. A lx1-enkele' pitite 'tor stone Crushers :ind the like compi-eingzi. toothed stntzlee layer :tntl :t subsurface hitter havingl tooth Shaped poi'tione integral with the Sinttit'e ltiyei und t'oinied :tltei'ntitely with portions oi tlitielent homogeneity with reSpet-t to Suid tooth fshnpt-d portions.

f2. it lnetih'ei' plete tol* stone ei'tishei'e und the liho eoinpi'isinii' :1 toothed Sinttiee layer :ind :t .enh-snitnee lnyei: hitting tooth shaped poi-tions dii-eetl)l heneitth the teeth of seidV sin'lnee lziyeif :ind integral therewith, seid tooth shaped poi'tione beineil foi'ined nlterntitely with portions oi diiieient homogeneity with teepeet. to seid tooth Iehnped poi'- tionet.

11. .A breaker plate for stone Crushers and the like eon'iprising :t toothed surface layer und :i` enh-Surface layer having tooth shaped poi-tions integral with the Surface lotyei'.` Stiid subsurface' layer heinea t'oifined hy the .Sides olE Suid tooth shaped portions with eztvities .tilled with portions o'lf different homogeneity froni'thzit of Suid tooth Shaped poi-tions.

4. A breaker plate :tor stone ernshei's und the like eoinln'ising ti. toothed surface layer :1nd at snbfstnt'ttee loyer having,` tooth shaped portions beneath the teeth ol said sul'ituee hiyel' :ind Shaped similarly to Seid teeth, Seid tooth shaped ptn'tion being` integral with said Sin-tace lttyei' :ind being;l :i1-ranged alternately with eovitiee` tilled with por tions ot dill'ei'ent hointntg'eneit)7 with respect to said tooth shaped portions.`

In testimony whereof I have signed my ntnne to this Speeitiezttion.`

FOUL BECI-IGAARD. 

